[c-nsp] 10GE card for 7609

[Dodd, Steven]

Keith Tokash has a pretty good writeup on the 6704 vs 6708 buffer issue:

http://www.cciecandidate.com/?p=505

-Steve

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Jason Lixfeld
Sent: Tuesday, March 31, 2009 1:38 PM
To: Richard A Steenbergen
Cc: Gert Doering; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] 10GE card for 7609

Looks like the 6708 isn't as bad as we think.

On 2009-03-31, at 4:12 PM, Richard A Steenbergen <ras at e-gerbil.net>  
wrote:

> On Tue, Mar 31, 2009 at 10:01:24AM +0200, Gergely Antal wrote:
>> I meant that you can not push 40G out of a 6704
>> even with a dfc attached to it.But you can do it with a 6708
>> with 1:1 subscription.
>
> Worse, some days you can't even get 7G in from a single port on a 6704
> with the other 3 ports unused. We routinely have problems with ingress
> interface overruns or egress interface output queue overflows on 6704
> in that traffic range, and DFC doesn't make any difference.
>
> It seems like it is head of line blocking, and TAC's only answer is
> "those things have no buffers, buy a 6708". The problem can usually be
> worked around by changing the way traffic is being mapped between the
> ports. For example, the one that seems to be the absolute worst case  
> is
> "in one port and out the other on the same fabric channel", i.e. in  
> port
> 1 and out port 2 or the same thing on 3/4.
>
> -- 
> Richard A Steenbergen <ras at e-gerbil.net>
http://www.e-gerbil.net/ras
> GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1  
> 2CBC)
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